Biomimetic Nanofibrous Aerogels Enabling High‐Temperature PM Filtration and Photocatalytic CO ₂ Conversion for Sustainable Industrial Filtration Systems

Industrial particulate matter (PM) and carbon dioxide (CO₂) emissions pose severe environmental health risks, yet developing high-temperature-resistant filters with concurrent PM capture and CO₂ conversion capabilities remains a critical challenge, driving demand for advanced multifunctional filtration materials. Here, a cactus-inspired multigradient multifunctional Indium oxide @ Bismuth Sulfobromide/oxidized polyaryl sulfide sulfone (In₂O₃@Bi₁₉Br₃S₂₇/OPASS (MMIB/OP)) nanofibrous aerogel that synergistically integrates PM filtration and CO₂ photocatalytic degradation will be presented. This aerogel was prepared by combining grooved-structured high-performance OPASS resin nanofibres with flower-like and spiny inorganic microstructures. The system achieves excellent PM_0.3 filtration efficiency (99.72%) at ultra-low pressure drop (71.48 Pa) under ambient conditions, while maintaining stable filtration performance at 300°C (96.66%). In addition, the filter was also able to exhibit excellent photocatalytic activity with a CO yield of 46.8 µmol·h^-1g^-1. Theoretical modelling and experimental results show that the air purification and photocatalysis of the MMIB/OP filter can be attributed to the uniform distribution of the S-type heterojunction catalysts on the surface of the groove-structured fibres. It provides a new strategy for developing highly efficient and durable multifunctional air filters, which is expected to promote the upgrading of industrial filtration systems toward green and low-carbon.